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The Information Commissioner’s Office, an independent regulator tasked with protecting customer privacy, confirmed it had been informed about the theft.

A spokesman confirmed the body would be “making inquiries” before adding they are currently “at a very early stage.”

British Airways tweeted yesterday: “We are investigating the theft of customer at a from our website and our mobile app as a matter of urgency.”

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However, a number of British Airways customers have complained they weren’t kept well informed about the breach.

Milton Keynes based Daniel Willis said: “I saw the tweet, that was the first I knew of it.

“This is my first involvement with BA since they left me stranded with my wife and 2-year-old daughter for a few days in Dusseldorf in December - again with no communication.

“I saw the tweet, that was the first I knew of it" (Image: GETTY)

“I’ve not heard anything from them on this and I’ve just had to cancel the card I used.

“They’re a shambles.

Rob Burgess, who edits a website dedicated to air travel, told The Daily Telegraph: “Data breaches are part and parcel of the world we now live in, and criminal activity is getting ever more sophisticated.

“Unfortunately this is likely to be another PR disaster for British Airways" (Image: GETTY)

“Unfortunately this is likely to be another PR disaster for British Airways, especially as it includes tickets brought in their September sale.